CN219697478U - Air conditioner - Google Patents
Air conditioner Download PDFInfo
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- CN219697478U CN219697478U CN202320520676.8U CN202320520676U CN219697478U CN 219697478 U CN219697478 U CN 219697478U CN 202320520676 U CN202320520676 U CN 202320520676U CN 219697478 U CN219697478 U CN 219697478U
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- 238000005070 sampling Methods 0.000 claims abstract description 262
- 238000001914 filtration Methods 0.000 claims abstract description 24
- 239000003990 capacitor Substances 0.000 claims description 30
- 238000001514 detection method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000003985 ceramic capacitor Substances 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model discloses an air conditioner, which comprises a rectifying module, a power factor correcting module, a direct current main sampling module, a direct current auxiliary sampling module, a filtering module and a control unit, wherein the control unit is configured to judge whether to feed back a module fault signal according to the ratio of the voltage of a first sampling point to the voltage of a second sampling point and the preset resistance parameter of the direct current auxiliary sampling module.
Description
Technical Field
The utility model relates to the field of air conditioners, in particular to an air conditioner.
Background
At present, when a filter capacitor in a sampling circuit fails, a conventional circuit or a control scheme cannot directly judge that the circuit fails, and for a PFC (Power Factor Correction ) circuit, the circuit is usually judged to be abnormal by judging the sampling difference of alternating voltage and direct voltage, but the conventional circuit can only convert when the PFC circuit does not work and cannot monitor the circuit in real time.
For example, as shown in fig. 1 and 2, a schematic diagram of a conventional resistor-divider voltage sampling circuit in the related art is shown. The conventional resistor voltage division type voltage sampling circuit is provided with a filter circuit at the last stage of the voltage sampling circuit, and is usually a dielectric RC low-pass filter, namely a filter consisting of a filter resistor R6 and a filter capacitor C2, wherein the filter capacitor C2 is commonly a chip ceramic capacitor, the chip ceramic capacitor is invalid due to the influence of stress and the like, the filter capacitor C2 breaks down to be in a resistance state, the voltage sampled by the sampling circuit is lower, the control output signal is possibly increased when the PFC direct-current voltage is sampled, and the output overvoltage causes the device in the sampling circuit to be invalid.
Disclosure of Invention
The present utility model aims to solve at least one of the technical problems existing in the prior art.
Therefore, an object of the present utility model is to provide an air conditioner that solves the problem of PFC circuit failure caused by filter capacitor failure.
In order to achieve the above object, an embodiment of a first aspect of the present utility model provides an air conditioner including: the input end of the rectifying module is suitable for being connected to an alternating current power supply; the input end of the power factor correction module is connected with the output end of the rectification module; the direct current main sampling module is provided with a first sampling point, one end of the direct current main sampling module is connected with the positive electrode of the output end of the power factor correction module, and the other end of the direct current main sampling module is grounded; the direct current auxiliary sampling module is connected with the first sampling point at one end and grounded at the other end; the filtering module is connected with the direct current auxiliary sampling module at one end and grounded at the other end, and is provided with a second sampling point; the control unit is respectively connected with the first sampling point and the second sampling point; the control unit is configured to judge whether to feed back a module fault signal according to the ratio of the voltage of the first sampling point to the voltage of the second sampling point and the preset resistance parameter of the direct current auxiliary sampling module.
According to the air conditioner provided by the embodiment of the utility model, through linkage control of the direct current main sampling module and the direct current auxiliary sampling module, whether a module fault signal is fed back is judged according to the relation between the voltage ratio of the first sampling point and the voltage of the second sampling point and the preset resistance parameter of the direct current auxiliary sampling module, and the problem of PFC circuit failure caused by filter capacitor C2 failure is solved.
In some embodiments, the dc auxiliary sampling modules are plural, each dc auxiliary sampling module includes an auxiliary upper voltage dividing resistor group and an auxiliary lower voltage dividing resistor group, one end of the auxiliary lower voltage dividing resistor group is connected to one end of the auxiliary upper voltage dividing resistor group and the other end is grounded; the direct current auxiliary sampling modules are sequentially ordered, the other end of each auxiliary upper voltage dividing resistor group of each direct current auxiliary sampling module is connected with one end of the auxiliary lower voltage dividing resistor group of the previous direct current auxiliary sampling module, the other end of the auxiliary upper voltage dividing resistor group of the direct current auxiliary sampling module with the smallest sequence number is connected with the first sampling point, and one end of the filtering module is connected with one end of the auxiliary lower voltage dividing resistor group of the direct current auxiliary sampling module with the largest sequence number.
In some embodiments, the direct current auxiliary sampling module is one, the direct current auxiliary sampling module comprises an auxiliary upper voltage dividing resistor group and an auxiliary lower voltage dividing resistor group, one end of the auxiliary lower voltage dividing resistor group is connected with one end of the auxiliary upper voltage dividing resistor group and the other end of the auxiliary lower voltage dividing resistor group is grounded, the other end of the auxiliary upper voltage dividing resistor group is connected with the first sampling point, and one end of the filtering module is connected with one end of the auxiliary lower voltage dividing resistor group.
In some embodiments, whether to feed back the module fault signal is determined according to the ratio of the voltage of the first sampling point and the voltage of the second sampling point, the resistance values of the auxiliary upper voltage dividing resistor groups and the resistance values of the auxiliary lower voltage dividing resistor groups of all the direct current auxiliary sampling modules.
In some embodiments, the filtering module comprises: one end of the filter resistor is connected with one end of the voltage dividing resistor group under the assistance of the direct current auxiliary sampling module with the largest serial number; one end of the filter capacitor is connected with the other end of the filter resistor, and the other end of the filter capacitor is grounded; the second sampling point is formed between one end of the filter capacitor and the other end of the filter resistor.
In some embodiments, calculating the sum of the resistance value of the auxiliary upper voltage dividing resistance group and the resistance value of the auxiliary lower voltage dividing resistance group of the direct current auxiliary sampling module, and calculating the product A of the sum of the resistance values of the auxiliary upper voltage dividing resistance group and the resistance values of the auxiliary lower voltage dividing resistance group of all the direct current auxiliary sampling modules; calculating the product of the resistance values of the voltage dividing resistor groups under the assistance of the direct current auxiliary sampling module to obtain B; calculating the ratio C of the voltage of the first sampling point and the voltage of the second sampling point; if N is less than or equal to C-A/B is less than or equal to M, the module fault signal is not fed back, otherwise, the module fault signal is fed back; wherein N is the upper bias threshold of the protection trigger, and M is the lower bias threshold of the protection trigger.
In some embodiments, the set of auxiliary upper voltage dividing resistors comprises one auxiliary upper voltage dividing resistor or a plurality of auxiliary upper voltage dividing resistors connected in series; the auxiliary lower voltage dividing resistor group comprises an auxiliary lower voltage dividing resistor or a plurality of auxiliary lower voltage dividing resistors connected in series.
In some embodiments, the direct current main sampling module comprises: one end of the main upper voltage dividing resistor group is connected with the positive electrode of the output end of the power factor correction module; one end of the main lower voltage dividing resistor group is connected with the other end of the main upper voltage dividing resistor group, and the other end of the main lower voltage dividing resistor group is grounded; the first sampling point is formed between the one end of the main lower voltage dividing resistor group and the other end of the main upper voltage dividing resistor group.
In some embodiments, the main upper voltage dividing resistor group comprises a main upper voltage dividing resistor or a plurality of main upper voltage dividing resistors connected in series; the main lower voltage dividing resistor group comprises a main lower voltage dividing resistor or a plurality of main lower voltage dividing resistors connected in series.
In some embodiments, the power factor correction module is turned off when a feedback module fails to signal.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of a conventional resistor-divider voltage sampling circuit in the related art;
FIG. 2 is a schematic diagram of a conventional resistor-divider voltage sampling circuit in the related art;
fig. 3 is a block diagram of an air conditioner according to an embodiment of the present utility model;
fig. 4 is a schematic structural view of an air conditioner according to an embodiment of the present utility model;
fig. 5 is a schematic view of a structure of an air conditioner according to an embodiment of the present utility model;
fig. 6 is a flowchart of a fault detection method of an air conditioner according to an embodiment of the present utility model.
Reference numerals: an air conditioner 1; a rectifying module 11; a power factor correction module 12; a direct current main sampling module 13; a DC auxiliary sampling module 14; a dc auxiliary sampling module 141; a dc-assisted sampling module 142; a filtering module 15; a control unit 16; an ac sampling module 17.
Detailed Description
Embodiments of the present utility model will be described in detail below, by way of example with reference to the accompanying drawings.
In the related art, as shown in fig. 1 and 2, a schematic diagram of a conventional resistor-divider voltage sampling circuit in the related art is shown. The conventional resistor voltage division type voltage sampling circuit detects alternating current voltage through a sampling point MCU-AD2 in the alternating current sampling circuit, detects direct current voltage through a sampling point MCU-AD1 in the direct current sampling circuit, judges sampling difference between the alternating current voltage and the direct current voltage, protects and corrects the sampling circuit, and performs self-checking on the sampling circuit before the PFC circuit is started.
Therefore, the air conditioner provided by the embodiment of the utility model realizes the monitoring of the voltage sampling parameters of the sampling circuit through the two-stage voltage linkage sampling of the direct current main sampling module and the direct current auxiliary sampling module, and can be applied to the technical fields of PFC circuits, power supply related circuits and power electronics of air conditioners or other electric appliances, so that devices in the sampling circuit are protected, and the problem of PFC circuit failure caused by filter capacitor failure can be solved.
An air conditioner 1 according to an embodiment of the present utility model is described below with reference to fig. 3 to 6.
As shown in fig. 3, an air conditioner 1 according to an embodiment of the present utility model includes: the device comprises a rectifying module 11, a power factor correction module 12, a direct current main sampling module 13, a direct current auxiliary sampling module 14, a filtering module 15 and a control unit 16.
The input end of the rectifying module 11 is suitable for being connected to an alternating current power supply; the input end of the power factor correction module 12 is connected with the output end of the rectification module 11; one end of the direct current main sampling module 13 is connected to the positive electrode of the output end of the power factor correction module 12, the other end of the direct current main sampling module 13 is grounded, and the direct current main sampling module 13 is provided with a first sampling point; one end of the direct current auxiliary sampling module 14 is connected to the first sampling point, and the other end of the direct current auxiliary sampling module 14 is grounded; one end of the filtering module 15 is connected to the direct current auxiliary sampling module 14, the other end of the filtering module 15 is grounded, and the filtering module 15 is provided with a second sampling point; the control unit 16 is connected with the first sampling point and the second sampling point respectively; the control unit 16 is configured to determine whether to feed back the module fault signal according to a ratio of the voltage at the first sampling point and the voltage at the second sampling point and a resistance preset parameter of the dc auxiliary sampling module 14.
In an embodiment, as shown in fig. 4, the input end of the rectifying module 11 is adapted to be connected to an ac power source; the input end of the power factor correction module 12 is connected to the output end of the rectification module 11, wherein the power factor correction module 12 comprises a first inductor L1, a first triode Q1, a first diode D1 and an electrolytic capacitor C-BUS; one end of the direct current main sampling module 13 is connected with the positive electrode of the output end of the power factor correction module 12, namely the positive electrode of the electrolytic capacitor C-BUS of the power factor correction module 12, and the other end of the direct current main sampling module 13 is grounded, wherein the direct current main sampling module 13 comprises two main voltage dividing resistor groups, and the direct current main sampling module 13 is provided with a first sampling point, for example, marked as MCU-AD3; one end of the direct current auxiliary sampling module 14 is connected to the first sampling point MCU-AD3, and the other end of the direct current auxiliary sampling module 14 is grounded, wherein the direct current auxiliary sampling module 14 comprises two auxiliary voltage dividing resistor groups; one end of the filtering module 15 is connected to the dc auxiliary sampling module 14, and the other end of the filtering module 15 is grounded, where the filtering module 15 includes a filtering resistor R6 and a filtering capacitor C2, and the filtering module 15 has a second sampling point, for example, denoted as MCU-AD1.
The control unit 16 is respectively connected with the first sampling point MCU-AD3 and the second sampling point MCU-AD1, acquires the voltage acquired by the first sampling point MCU-AD3 and the voltage acquired by the second sampling point MCU-AD1 in real time, judges whether the difference value between the voltage of the first sampling point MCU-AD3 and the voltage of the second sampling point MCU-AD1 and the preset resistance parameter of the direct current auxiliary sampling module 14 is within a preset range according to the relation between the voltage of the first sampling point MCU-AD3 and the voltage of the second sampling point MCU-AD1 and the preset resistance parameter of the direct current auxiliary sampling module 14, and if the difference value between the voltage of the first sampling point MCU-AD3 and the preset resistance parameter of the direct current auxiliary sampling module 14 is within the preset range, considers that the sampling circuit operates normally, and maintains the current state of the sampling circuit; if the difference between the voltage of the first sampling point MCU-AD3 and the voltage of the second sampling point MCU-AD1 and the preset resistance parameter of the dc auxiliary sampling module 14 exceeds the preset range, the filter capacitor C2 of the filter module 15 in the sampling circuit is considered to be damaged, so that the voltage acquired by the second sampling point MCU-AD1 is not very accurate, the fault signal of the sampling circuit is determined to be generated, and the control unit 16 feeds back the fault signal of the module, and the accuracy of detecting the fault by the sampling circuit is improved by acquiring the voltages of the first sampling point MCU-AD3 and the second sampling point MCU-AD1 in real time.
The air conditioner 1 further comprises an alternating current sampling module 17, the alternating current sampling module comprises a first resistor R1, a second resistor R2, a third resistor R3 and a first inductor C1, wherein a third sampling point MCU-AD2 is formed between one end of the third resistor R3 and the other end of the first inductor C1, and whether the fault occurs in a sampling circuit is detected by comparing voltages sampled by the direct current main sampling module 13 and the alternating current sampling module 17 or voltages sampled by the direct current auxiliary sampling module 14 and the alternating current sampling module 17 or not, and the detection accuracy of the sampling circuit is higher by comparing the voltages twice.
According to the air conditioner 1 of the embodiment of the utility model, through linkage control of the direct current main sampling module 13 and the direct current auxiliary sampling module 14, whether a module fault signal is fed back is judged according to the relation between the voltage of the first sampling point and the voltage of the second sampling point and the preset resistance parameter of the direct current auxiliary sampling module 14, and the problem of PFC circuit failure caused by filter capacitor C2 failure is solved.
In some embodiments, the dc auxiliary sampling modules 14 are multiple, each of which includes an auxiliary upper voltage dividing resistor set and an auxiliary lower voltage dividing resistor set, one end of the auxiliary lower voltage dividing resistor set is connected to one end of the auxiliary upper voltage dividing resistor set and the other end is grounded; the plurality of direct current auxiliary sampling modules are sequentially ordered, the other end of the auxiliary upper voltage dividing resistor group of each direct current auxiliary sampling module is connected with one end of the auxiliary lower voltage dividing resistor group of the previous direct current auxiliary sampling module, the other end of the auxiliary upper voltage dividing resistor group of the direct current auxiliary sampling module with the smallest sequence number is connected with the first sampling point, and one end of the filtering module 15 is connected with one end of the auxiliary lower voltage dividing resistor group of the direct current auxiliary sampling module with the largest sequence number.
In the embodiment, the number of the dc auxiliary sampling modules 14 is plural, and the number of the dc auxiliary sampling modules 14 is two, for example, as shown in fig. 5, the first one is, for example, denoted as a dc auxiliary sampling module 141, and includes an auxiliary upper voltage dividing resistor group R8 and an auxiliary lower voltage dividing resistor group R7, the second one is, for example, denoted as a dc auxiliary sampling module 142, and includes an auxiliary upper voltage dividing resistor group R9 and an auxiliary lower voltage dividing resistor group R10, one end of the auxiliary lower voltage dividing resistor group R7 of the dc auxiliary sampling module 141 is connected to one end of the auxiliary upper voltage dividing resistor group R8 and the other end of the auxiliary lower voltage dividing resistor group R7 is grounded, and one end of the auxiliary lower voltage dividing resistor group R10 of the dc auxiliary sampling module 142 is connected to one end of the auxiliary upper voltage dividing resistor group R9 and the other end of the auxiliary lower voltage dividing resistor group R10 is grounded; the other end of the auxiliary upper voltage dividing resistor group R9 of the direct current auxiliary sampling module 142 is connected to one end of the auxiliary lower voltage dividing resistor group R7 of the previous direct current auxiliary sampling module 141, the other end of the auxiliary upper voltage dividing resistor group R8 of the direct current auxiliary sampling module 141 with the smallest sequence number is connected to the first sampling point MCU-AD3, and the one end of the auxiliary lower voltage dividing resistor group R10 of the direct current auxiliary sampling module 142 with the largest sequence number is connected to the filtering module 15.
In some embodiments, as shown in fig. 4, the dc auxiliary sampling module 14 is one, and the dc auxiliary sampling module 14 includes an auxiliary upper voltage dividing resistor set R8 and an auxiliary lower voltage dividing resistor set R7, one end of the auxiliary lower voltage dividing resistor set R7 is connected to one end of the auxiliary upper voltage dividing resistor set R8 and the other end of the auxiliary lower voltage dividing resistor set R7 is grounded, the other end of the auxiliary upper voltage dividing resistor set R8 is connected to the first sampling point MCU-AD3, and one end of the filtering module 15 is connected to one end of the auxiliary lower voltage dividing resistor set R7, so that the sampling circuit is simple in structure and high in production efficiency while ensuring detection accuracy.
In some embodiments, whether to feed back the module fault signal is determined according to the ratio of the voltage of the first sampling point MCU-AD3 and the voltage of the second sampling point MCU-AD1, the resistance values of the auxiliary upper voltage dividing resistor groups and the resistance values of the auxiliary lower voltage dividing resistor groups of all the direct current auxiliary sampling modules.
In the embodiment, the control unit 16 obtains the voltage collected by the first sampling point MCU-AD3 and the voltage collected by the second sampling point MCU-AD1, and determines whether to feed back the module fault signal according to the ratio of the voltage of the first sampling point MCU-AD3 to the voltage of the second sampling point MCU-AD1, and the relation between the resistance values of the auxiliary upper voltage dividing resistor group and the resistance values of the auxiliary lower voltage dividing resistor group of all the dc auxiliary sampling modules.
For example, taking fig. 5 as an example, a relationship between a ratio of the voltage of the first sampling point MCU-AD3 and the voltage of the second sampling point MCU-AD1 and a resistance value of the auxiliary upper voltage dividing resistor set R8 and a resistance value of the auxiliary lower voltage dividing resistor set R7 of the dc auxiliary sampling module 14 is determined, and if the MCU-AD3/MCU-AD 1= (r7+r8)/R7, the sampling circuit is considered to operate normally, the current state of the sampling circuit is maintained; if the voltages are inconsistent, the filter capacitor C2 of the filter module 15 in the sampling circuit is considered to fail, the voltage acquired by the second sampling point MCU-AD1 corresponds to the partial voltage of the filter resistor R6 on the filter capacitor C2, so that the voltage acquired by the MCU-AD1 is lower than the normal sampling value, the sampling circuit is determined to fail, a module failure signal is fed back, if the power factor correction module 12 is in a working state, the power factor correction module 12 increases the output voltage due to the adoption of closed loop control, and the actual output voltage is higher than the target value, so that the output overvoltage causes the failure of the device.
In some embodiments, the filtering module 15 includes: the filter resistor R6 and the filter capacitor C2, wherein one end of the filter resistor R6 is connected with one end of the voltage dividing resistor group under the assistance of the direct current auxiliary sampling module with the largest serial number; one end of the filter capacitor C2 is connected with the other end of the filter resistor R6, and the other end of the filter capacitor C2 is grounded; the second sampling point MCU-AD1 is formed between one end of the filter capacitor C2 and the other end of the filter resistor R6.
In the embodiment, as shown in fig. 5, since there are two dc auxiliary sampling modules 14, one end of the filter resistor R6 is connected to one end of the voltage dividing resistor set R10 under the assistance of the dc auxiliary sampling module with the largest serial number, that is, the dc auxiliary sampling module 142; as shown in fig. 4, since the dc auxiliary sampling module 14 is one, one end of the filter resistor R6 is directly connected to one end of the voltage dividing resistor set R7 under the assistance of the dc auxiliary sampling module 14, so as to reduce the interference effect caused by the Q1IGBT or MOSFET switching device in the circuit, where the filter capacitor C2 is generally a chip ceramic capacitor, and the chip ceramic capacitor fails due to the influence of stress, etc., so that the capacitor breaks down to be in a resistive state.
In some embodiments, the sum of the resistance of the auxiliary upper voltage-dividing resistance group and the resistance of the auxiliary lower voltage-dividing resistance group of the direct-current auxiliary sampling module 14 is calculated, and the product a of the sum of the resistance of the auxiliary upper voltage-dividing resistance group and the resistance of the auxiliary lower voltage-dividing resistance group of all the direct-current auxiliary sampling modules is calculated; calculating the product B of the resistance values of the voltage dividing resistor groups under the assistance of all the direct current auxiliary sampling modules; calculating the ratio C of the voltage of the first sampling point and the voltage of the second sampling point; if N is less than or equal to C-A/B is less than or equal to M, the module fault signal is not fed back, otherwise, the module fault signal is fed back; wherein N is the upper bias threshold of the protection trigger, and M is the lower bias threshold of the protection trigger.
In the embodiment, taking fig. 5 as an example, the number of the dc auxiliary sampling modules 14 is two, the first is, for example, denoted as a dc auxiliary sampling module 141, the second is, for example, denoted as a dc auxiliary sampling module 142, a sum of a resistance value of an auxiliary upper voltage dividing resistance group R8 and a resistance value of an auxiliary lower voltage dividing resistance group R7 of the dc auxiliary sampling module 141, that is, r8+r7, and a sum of a resistance value of an auxiliary upper voltage dividing resistance group R9 and a resistance value of an auxiliary lower voltage dividing resistance group R10 of the dc auxiliary sampling module 142, that is, r9+r10, are calculated, and a product a of a sum of a resistance value of an auxiliary upper voltage dividing resistance group R8 and a resistance value of an auxiliary lower voltage dividing resistance group R10 of the dc auxiliary sampling module 142, that is, a= (r8+r7) × (r9+r10); calculating a product B of the resistance value of the auxiliary voltage dividing resistor group R7 of the direct current auxiliary sampling module 141 and the resistance value of the auxiliary voltage dividing resistor group R10 of the direct current auxiliary sampling module 142, namely b=r7×r10; calculating the ratio C of the voltage of the first sampling point MCU-AD3 and the voltage of the second sampling point MCU-AD1, namely C=MCU-AD 3/MCU-AD1; and calculating the magnitude relation between the difference value between the product A of the sum of the resistance values of the auxiliary upper voltage dividing resistor groups of all the direct current auxiliary sampling modules and the resistance values of the auxiliary lower voltage dividing resistor groups and the product B of the resistance values of the auxiliary lower voltage dividing resistor groups of all the direct current auxiliary sampling modules, namely A/B, the ratio C of the voltage of the first sampling point MCU-AD3 and the voltage of the second sampling point MCU-AD1, namely C-A/B, and the protection trigger threshold protection trigger upper bias threshold is recorded as N and the protection trigger lower bias threshold is recorded as M.
If N is less than or equal to C-A/B is less than or equal to M, the sampling circuit is considered to be normal in operation, the module fault signal is not fed back, otherwise, the filter capacitor C2 of the filter module in the sampling circuit is considered to be invalid, and the module fault signal is fed back.
A fault detection method of an air conditioner according to an embodiment of the present utility model will be illustrated with reference to fig. 6.
As shown in fig. 6, the fault detection method of the air conditioner according to the embodiment of the present utility model at least includes steps S1 to S7.
In step S1, the control unit acquires the voltage acquired by the first sampling point MCU-AD3 and the voltage acquired by the second sampling point MCU-AD1.
And S2, calculating the sum of the resistance value of the auxiliary upper voltage dividing resistor group and the resistance value of the auxiliary lower voltage dividing resistor group of the direct current auxiliary sampling module, and calculating the product A of the sum of the resistance values of the auxiliary upper voltage dividing resistor groups and the resistance values of the auxiliary lower voltage dividing resistor groups of all the direct current auxiliary sampling modules.
And S3, calculating the product B of the resistance values of the voltage dividing resistor groups under the assistance of all the direct current auxiliary sampling modules.
Step S4, calculating the ratio C of the voltage of the first sampling point MCU-AD3 and the voltage of the second sampling point MCU-AD1.
S5, judging that N is less than or equal to C-A/B is less than or equal to M, and if so, executing se:Sub>A step S6; if not, go to step S7.
And S6, the sampling circuit operates normally and does not feed back a module fault signal.
And S7, the filter capacitor C2 of the filter module in the circuit is invalid, and a module fault signal is fed back.
In some embodiments, the set of auxiliary upper voltage dividing resistors R8 comprises one auxiliary upper voltage dividing resistor or a plurality of auxiliary upper voltage dividing resistors connected in series; the auxiliary lower voltage dividing resistor group R7 includes one auxiliary lower voltage dividing resistor or a plurality of auxiliary lower voltage dividing resistors connected in series.
In an embodiment, the number of resistors in the auxiliary upper voltage-dividing resistor set R8 and the auxiliary lower voltage-dividing resistor set R7 in the sampling circuit is determined by the actual circuit selection, for example, the auxiliary upper voltage-dividing resistor set R8 may be composed of one auxiliary upper voltage-dividing resistor or a plurality of auxiliary upper voltage-dividing resistors connected in series, and similarly, the auxiliary upper voltage-dividing resistor set R7 may be composed of one auxiliary upper voltage-dividing resistor or a plurality of auxiliary upper voltage-dividing resistors connected in series, and by setting the number of resistors in the auxiliary upper voltage-dividing resistor set R8 and the auxiliary lower voltage-dividing resistor set R7 to one or more, the free adjustment is facilitated according to the actual condition of the circuit.
In some embodiments, the direct current main sampling module 13 includes: the main upper voltage dividing resistor group is denoted as R4 for example and the main lower voltage dividing resistor group is denoted as R5 for example.
In the embodiment, one end of the main upper voltage dividing resistor group R4 is connected with the positive electrode of the output end of the power factor correction module 12, namely the positive electrode of the electrolytic capacitor C-BUS of the power factor correction module 12; one end of the main lower voltage dividing resistor group R5 is connected with the other end of the main upper voltage dividing resistor group R4, and the other end of the main lower voltage dividing resistor group R5 is grounded; the first sampling point MCU-AD3 is formed between one end of the main lower voltage dividing resistor group R5 and the other end of the main upper voltage dividing resistor group R4.
In some embodiments, the main upper voltage dividing resistor group R4 includes one main upper voltage dividing resistor or a plurality of main upper voltage dividing resistors connected in series; the main lower voltage dividing resistor group R5 includes one main lower voltage dividing resistor or a plurality of main lower voltage dividing resistors connected in series.
In an embodiment, the number of resistors in the main upper voltage-dividing resistor group R4 and the main lower voltage-dividing resistor group R5 in the sampling circuit is determined by the actual circuit selection, for example, the main upper voltage-dividing resistor group R4 may be composed of one main upper voltage-dividing resistor or a plurality of main upper voltage-dividing resistors connected in series, and similarly, the main upper voltage-dividing resistor group R4 may be composed of one main upper voltage-dividing resistor or a plurality of main upper voltage-dividing resistors connected in series, and by setting the number of resistors in the main upper voltage-dividing resistor group R4 and the main lower voltage-dividing resistor group R5 to one or more, it is convenient to freely adjust according to the actual situation of the circuit.
In some embodiments, the power factor correction module 12 is turned off when the feedback module fails to signal.
In an embodiment, the control unit 16 detects that the sampling circuit is abnormal in sampling, triggers the feedback module fault signal, and turns off the power factor correction module 12, so as to prevent the power factor correction module 12 from continuously outputting incorrect dc voltage, and keep the circuit in a fault state continuously.
According to the air conditioner 1 of the embodiment of the utility model, through linkage control of the direct current main sampling module 13 and the direct current auxiliary sampling module 14, whether a module fault signal is fed back is judged according to the relation between the voltage of the first sampling point and the voltage of the second sampling point and the preset resistance parameter of the direct current auxiliary sampling module 14, and the problem of PFC circuit failure caused by filter capacitor C2 failure is solved.
In the description of the present utility model, "plurality" means two or more.
In the description of the utility model, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by another feature therebetween.
In the description of the utility model, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by another feature therebetween.
In the description of the utility model, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature.
Other components such as ac sampling modules and the like and operation of the air conditioner according to the embodiments of the present utility model are known to those skilled in the art, and will not be described in detail herein.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.
While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. An air conditioner, comprising:
the input end of the rectifying module is suitable for being connected to an alternating current power supply;
the input end of the power factor correction module is connected with the output end of the rectification module;
the direct current main sampling module is provided with a first sampling point, one end of the direct current main sampling module is connected with the positive electrode of the output end of the power factor correction module, and the other end of the direct current main sampling module is grounded;
the direct current auxiliary sampling module is connected with the first sampling point at one end and grounded at the other end;
the filtering module is connected with the direct current auxiliary sampling module at one end and grounded at the other end, and is provided with a second sampling point;
the control unit is respectively connected with the first sampling point and the second sampling point;
the control unit is configured to judge whether to feed back a module fault signal according to the ratio of the voltage of the first sampling point to the voltage of the second sampling point and the preset resistance parameter of the direct current auxiliary sampling module.
2. The air conditioner of claim 1, wherein the plurality of dc auxiliary sampling modules are provided, each of the dc auxiliary sampling modules includes an auxiliary upper voltage dividing resistor group and an auxiliary lower voltage dividing resistor group, one end of the auxiliary lower voltage dividing resistor group is connected to one end of the auxiliary upper voltage dividing resistor group and the other end is grounded;
the direct current auxiliary sampling modules are sequentially ordered, the other end of each auxiliary upper voltage dividing resistor group of each direct current auxiliary sampling module is connected with one end of the auxiliary lower voltage dividing resistor group of the previous direct current auxiliary sampling module, the other end of the auxiliary upper voltage dividing resistor group of the direct current auxiliary sampling module with the smallest sequence number is connected with the first sampling point, and one end of the filtering module is connected with one end of the auxiliary lower voltage dividing resistor group of the direct current auxiliary sampling module with the largest sequence number.
3. The air conditioner of claim 1, wherein the dc auxiliary sampling module is one, the dc auxiliary sampling module includes an auxiliary upper voltage dividing resistor group and an auxiliary lower voltage dividing resistor group, one end of the auxiliary lower voltage dividing resistor group is connected to one end of the auxiliary upper voltage dividing resistor group and the other end is grounded, the other end of the auxiliary upper voltage dividing resistor group is connected to the first sampling point, and the one end of the filtering module is connected to the one end of the auxiliary lower voltage dividing resistor group.
4. The air conditioner according to claim 2 or 3, wherein whether to feed back the module fault signal is determined according to a ratio of the voltage of the first sampling point to the voltage of the second sampling point, resistance values of the auxiliary upper voltage dividing resistor groups and resistance values of the auxiliary lower voltage dividing resistor groups of all the dc auxiliary sampling modules.
5. An air conditioner according to claim 2 or 3, wherein the filtering module comprises:
one end of the filter resistor is connected with one end of the voltage dividing resistor group under the assistance of the direct current auxiliary sampling module with the largest serial number;
one end of the filter capacitor is connected with the other end of the filter resistor, and the other end of the filter capacitor is grounded;
the second sampling point is formed between one end of the filter capacitor and the other end of the filter resistor.
6. The air conditioner of claim 5, wherein a sum of resistance values of an auxiliary upper voltage dividing resistance group and resistance values of an auxiliary lower voltage dividing resistance group of the direct current auxiliary sampling module is calculated, and a product a of the sum of resistance values of the auxiliary upper voltage dividing resistance group and resistance values of the auxiliary lower voltage dividing resistance group of all the direct current auxiliary sampling modules is calculated;
calculating the product of the resistance values of the voltage dividing resistor groups under the assistance of the direct current auxiliary sampling module to obtain B;
calculating the ratio C of the voltage of the first sampling point and the voltage of the second sampling point;
if N is less than or equal to C-A/B is less than or equal to M, the module fault signal is not fed back, otherwise, the module fault signal is fed back;
wherein N is the upper bias threshold of the protection trigger, and M is the lower bias threshold of the protection trigger.
7. An air conditioner according to claim 2 or 3 wherein the auxiliary upper voltage dividing resistor group comprises an auxiliary upper voltage dividing resistor or a plurality of auxiliary upper voltage dividing resistors connected in series;
the auxiliary lower voltage dividing resistor group comprises an auxiliary lower voltage dividing resistor or a plurality of auxiliary lower voltage dividing resistors connected in series.
8. The air conditioner according to claim 1, wherein the direct current main sampling module comprises:
one end of the main upper voltage dividing resistor group is connected with the positive electrode of the output end of the power factor correction module;
one end of the main lower voltage dividing resistor group is connected with the other end of the main upper voltage dividing resistor group, and the other end of the main lower voltage dividing resistor group is grounded;
the first sampling point is formed between the one end of the main lower voltage dividing resistor group and the other end of the main upper voltage dividing resistor group.
9. The air conditioner as claimed in claim 8, wherein the main upper voltage dividing resistor group includes one main upper voltage dividing resistor or a plurality of main upper voltage dividing resistors connected in series;
the main lower voltage dividing resistor group comprises a main lower voltage dividing resistor or a plurality of main lower voltage dividing resistors connected in series.
10. The air conditioner of claim 1, wherein the power factor correction module is turned off when a feedback module fails.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320520676.8U CN219697478U (en) | 2023-03-16 | 2023-03-16 | Air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320520676.8U CN219697478U (en) | 2023-03-16 | 2023-03-16 | Air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219697478U true CN219697478U (en) | 2023-09-15 |
Family
ID=87940308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320520676.8U Active CN219697478U (en) | 2023-03-16 | 2023-03-16 | Air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219697478U (en) |
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2023
- 2023-03-16 CN CN202320520676.8U patent/CN219697478U/en active Active
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